Apparatus and method for identifying seam deviation of rotating arc narrow gap mag welding based on visual sensing

Abstract

The invention discloses a rotating arc narrow gap MAG (metal active gas) welding seam offset identification device and method based on visual sensing. The device comprises a rotating arc welding torch, an arc rotational position sensor, an insulation module, a CCD (charge coupled device) camera and a PC (personal computer). The PC comprises an image capture card, an image denoising module, an arc center recognizing module, a bevel edge recognizing module, a current arc rotating period welding seam offset extracting module, and a counting module. The front of the CCD camera is provided with dimmer glass, an optical filter and a UV lens. The method includes adopting the CCD camera and triggering a sampling manner to accurately acquire welding images that an arc rotates to the left and right of a bevel in each arc rotating period, and rapidly detecting the left and right bevel positions of the arc in the two images to acquire welding seam offset. According to the device and the method, efficiency of acquiring the welding seam offset is high, calculating method is accurate and reliable, and bevel bottom changes and arc electrical signals are affected rarely, and the method and the device are adaptable to high-frequency rotating arc welding.

Description

technical field [0001] The invention relates to a visual sensing-based device and method for identifying seam deviation in a rotating arc narrow-gap MAG welding, and belongs to the technical field of welding automation. Background technique [0002] Rotary arc narrow-gap MAG welding, as an efficient welding technology, has the advantages of simple groove shape, small weld cross-sectional area, high welding efficiency, low energy consumption, low welding heat input, small welding heat-affected zone, and joint toughness Good and other advantages, it is widely used in the field of medium and thick plate welding. In order to ensure the welding quality and make both sides of the groove evenly penetrated, it is necessary to ensure the strict alignment between the arc center of the welding torch and the center of the workpiece groove. Therefore, in the welding process, real-time and effective tracking control is required, and the key is to be able to reliably extract the weld devi...

AI Technical Summary

Problems solved by technology

This method is only suitable for swinging arc with low frequency, not suitable for high frequency rotary arc welding, and the complete image during welding is not obtained, and typical welding process information such as groove edge and arc position are not extracted, which is not conducive to the welding process Research on real-time monitoring and subsequent seam tracking

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